One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,9,8)(7,11,12,10)(13,14,18,19)(15,20,17,16)(21,22)(23,29)(24,26)(25,32)(27,30)(28,33)(31,34)(35,36)(5,7)(6,10)(8,11)(9,12)(13,15,18,17)(14,16,19,20)(22,24)(23,30)(28,32)(31,36)(13,16)(14,15)(17,19)(18,20)(21,23)(22,27)(24,29)(25,31)(26,30)(28,34)(32,35)(33,36) involution — undirected(1,2)(3,4)(5,8,9,6)(7,11,12,10)(13,17,18,15)(14,16,19,20)(21,24,26,22)(23,29,30,27)(25,28,33,32)(31,34,36,35)(5,7)(6,11)(8,10)(9,12)(13,16)(14,17)(15,19)(18,20)(21,25,26,33)(22,28,24,32)(23,31,30,36)(27,34,29,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.